module.exports = {
    // 预设
    // 使其他浏览器也能识别  向下兼容
    presets: [
      [
        "@babel/preset-env",
        // 按需加载core-js的polyfill
        { useBuiltIns: "usage", corejs: { version: "3", proposals: true } },
      ],
    ],
    
  };
  